Roy "Tin Cup" McAvoy (Kevin Costner) is a former golf prodigy who has little ambition. He owns a driving range in West Texas, where he drinks and hangs out with his pal Romeo Posar (Cheech Marin) and their friends. Dr. Molly Griswold (Rene Russo), a clinical psychologist, wants a golf lesson. She asks Roy because he knows her boyfriend David Simms (Don Johnson), a top professional golfer. They were both on the golf team at the University of Houston. Roy is immediately attracted to Molly, but she sees through Roy's charm and resists.